Digital Petroleum Atlas
Llanos Field
General Information
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Digital Petroleum Atlas |
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| Llanos Field Oil & Gas Data | |||
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General Field Information | |
| Exploration Method: | Regional subsurface geology and seismic mapping followed by a core-drill program located the discovery well, the Llanos 1 in 6S-37W-10. This discovery well was one of several stratigraphic tests drilled in northwestern Kansas by Phillips Petroleum Company. |
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| Drilling Casing Practices: | Llanos 3 was a dual completion in one zone in the Lansing - Kansas City groups and two zones in the Marmaton group. The Hartley 'A' 1 and the Hartley 'A' 2 in section 3 were dually completed in the Lansing - Kansas City and Marmaton groups. Normal completion procedure is to set pipe below the Cherokee group, usually in the Mississippian, plug back, perforate porous intervals, and acidized. Fracturing is not necessary. In the average well, 370 feet of surface casing was set. |
| Comments: | Productive area was cited from the 1959 Kansas Oil and Gas Fields report. At that time the field development was not yet complete. There are 10 productive zones in the Llanos field, but not all zones produce in all wells. The zone thicknesses range from 2 to 16 feet, averaging 6 feet. Water production: Three of the first seven wells in Llanos Field were initially completed water-free. Later, all wells were producing some water. Llanos 5 in secion 10 was completed as a dry hole that was converted to a salt water disposal well with a maximum injection rate of 4,032 barrels of water per day into the Mississippian. Limits of water-free oil production are controlled by structure, but numerous productive zones complicate delineation of accurate oil-water contacts. Initially the structurally highest well, Llanos 1, encountered water-free production from the Lansing-Kansas City, Marmaton and Cherokee reservoirs. Llanos 5, the structurally lowest well in the field, indicated these reservoirs were water-bearing. |
Discovery Well(s) |
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| Discovery Date | Well Name | Available Well Data | Oil Production | Gas Production | LAS File Viewer with Core Data Plots | Core Image | Core Data Table |
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| 03 JUN 1958 | LLANOS 1 | 
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No Gas Production | No Digital LAS Files | No Core Images | No Core Data |
| Well Location: | C W2 NW NE 10-T6S-R37W |
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| Rotary Total Depth: | 5001 |
| Production Zone: | Cherokee Group |
| Initial Oil Potential: | 319 BOPD |
| Initial Formation Pressure: | 1115 |
| Perforations: | 4804'-4812' Cherokee Group, Desmoinesian Series, Pennsylvanian System |
| Data Source: | KOGF, Vol. II; DISCOVERY 3848 |
| Discovery Date | Well Name | Available Well Data | Oil Production | Gas Production | LAS File Viewer with Core Data Plots | Core Image | Core Data Table |
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| 10 DEC 1958 | HARTLEY 'A' 1 |
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No Gas Production | 
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No Core Images | No Core Data |
| Well Location: | C SW SE 3-T6S-R37W |
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| Rotary Total Depth: | 5352 |
| Production Zone: | MARMATON AND LANSING-KANSAS CITY OIL |
| Initial Oil Potential: | 289 BOPD from L-KC, plus 345 BOPD from Marmaton |
| Perforations: | 4425'-4509' Lansing-Kansas City Groups 4585'-4670' Marmaton |
| Comments: | Initial Reservior Pressures: 1320 in the Lansing-Kansas City 1373 in the Marmaton |
| Data Source: | KOGF, Vol. II; DISCOVERY 7574 |
Summary Production Information | |
| Field Size: | 640 acres |
| Total Wells: | 29 |
| Productive Oil Wells: | 9 as of March 2024 |
| Abandoned Wells: | 8 |
| Cumulative Oil: | 957,781.15 bbls as of March 2024 |
Producing Formation:LANS.-K.C. |
| Depth Top: | 4439 feet |
| Formation Lithology: | Cream to gray, dense, cherty limestones and buff, fine granular, dolomitic limestone with vuggy, pinpoint, and rare oolicastic porosity. |
| Trap Type: | The field is on the north flank of the Dodge City Basin. An anticline with approximately 25 feet of closure on the Lansing group provides entrapment in the Lansing-Kansas City, Marmaton and Cherokee reservoirs. In 1959 when the Kansas Oil and Gas Fields report was written, the Llanos Field development was not complete. |
LANS.-K.C. (Lansing - Kansas City Supergroup) |
| Thickness: | 12 feet | Maximum Thickness: | 16 feet | Average Thickness: | 6 feet |
LANS.-K.C. (Lansing - Kansas City Supergroup) |
| Produces Oil: | Yes |
| Drive Mechanism: | Water drive |
| Proven Production: | 440 acres |
LANS.-K.C. (Lansing - Kansas City Supergroup) |
| Minimum Oil API Gravity: | 33.8 | Maximum Oil API Gravity: | 39.5 % |
LANS.-K.C. (Lansing - Kansas City Supergroup) |
| Total Solids: | 33100 ppm | PH: | 8 |
| Chloride Equivalent: | 13500 ppm | Barium: | 0 ppm |
| Bicarbonates: | 0 ppm | Calcium: | 680 ppm |
| Calcium Bicarbonate: | 0 ppm | Calcium Sulfate: | 0 ppm |
| Iron: | 0 | Magnesium: | 380 ppm |
| Magnesium Sulfate: | 0 ppm | Silica: | 0 |
| Sodium Sulfate: | 3250 ppm | Sodium Chloride: | 0 ppm |
| Strontium: | 0 | Sulfates: | 0 ppm |
Producing Formation:MARMATON |
| Depth Top: | 4504 feet |
| Formation Lithology: | Cream to gray, dense, cherty limestones and buff, fine granular, dolomitic limestone with vuggy, pinpoint, and rare oolicastic porosity. |
| Trap Type: | The field is on the north flank of the Dodge City Basin. An anticline with approximately 25 feet of closure on the Lansing group provides entrapment in the Lansing-Kansas City, Marmaton and Cherokee reservoirs. In 1959 when the Kansas Oil and Gas Fields report was written, the Llanos Field development was not complete. |
MARMATON (Marmaton Group) |
| Thickness: | 5 feet | Maximum Thickness: | 16 feet | Average Thickness: | 6 feet |
MARMATON (Marmaton Group) |
| Produces Oil: | Yes |
| Drive Mechanism: | Water drive |
| Proven Production: | 160 acres |
MARMATON (Marmaton Group) |
| Carbon Dioxide: | 3 % |
| Methane: | 1 % | Butane: | 13.6 % | Ethane: | 4.5 % |
| Propane: | 15.7 % | Pentane: | 31.9 % | Hextane: | 22.2 % |
MARMATON (Marmaton Group) |
| Minimum Oil API Gravity: | 35.9 | Maximum Oil API Gravity: | 41.4 % |
Producing Formation:CHEROKEE |
| Depth Top: | 4804 feet |
| Formation Lithology: | Lowermost producing zone in the Cherokee is fine to very coarse, angular to sub-rounded, calcareous, shaly, conglomerate sandstone. Zones above this are cream to gray, dense, cherty limestones and buff, fine granular, dolomitic limestone with vuggy, pinpoint, and rare oolicastic porosity. |
| Trap Type: | The field is on the north flank of the Dodge City Basin. An anticline with approximately 25 feet of closure on the Lansing group provides entrapment in the Lansing-Kansas City, Marmaton and Cherokee reservoirs. In 1959 when the Kansas Oil and Gas Fields report was written, the Llanos Field development was not complete. |
CHEROKEE (Cherokee Group) |
| Thickness: | 8 feet | Maximum Thickness: | 16 feet | Average Thickness: | 6 feet |
CHEROKEE (Cherokee Group) |
| Produces Oil: | Yes |
| Drive Mechanism: | Water drive |
| Proven Production: | 40 acres |
CHEROKEE (Cherokee Group) |
| Carbon Dioxide: | 5.3 % |
| Methane: | 4.3 % | Butane: | 20.3 % | Ethane: | 9 % |
| Propane: | 33.1 % | Pentane: | 12 % | Hextane: | 12.3 % |
CHEROKEE (Cherokee Group) |
| Minimum Oil API Gravity: | 20.2 | Maximum Oil API Gravity: | 23.5 % |
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